Sciences and Future

Archaeologist & paléo

Paleontology

By

Joel ignasse

the 18.09.2020 at 4:01 p.m.

The beginning of the Triassic, a period that extends from -252 million years (Ma) at -201 Ma, is marked by the greatest extinction that the Earth has known, that of the Permian / Triassic and ends with another, the extinction of the Triassic / Jurassic. During this time, Earth has experienced a series of upheavals as well as the advent of iconic species such as marine reptiles, dinosaurs, pterosaurs or mammals. If the Triassic climate was rather arid, it was interspersed with an even more chaotic interval known as the Carnian, there is 237 at 227 million years, which resulted in another previously unnoticed extinction.

A team of 17 researchers, led by Jacopo Dal Corso from the Chinese University of Geosciences in Wuhan and Mike Benton from the School of Earth Sciences at the University of Bristol, focused on a period of a million years that began 232 My name “Episode pluvial du Carnien” (CPE) and during which the climate was particularly hot and rainy. These are undoubtedly massive volcanic eruptions, springing from the magmatic province of Wrangellia located on the Pacific Rim of Alaska and Canada, which are at the origin of it due to the large amount of greenhouse gases they have released into the atmosphere.

According to the researchers, who publish a paper in the journal Sciences Advances, CEP has caused major biodiversity loss in seas and land. Important enough that they use the term mass extinction. This would be the sixth identified during the 500 last million years. According to their estimates, marine biodiversity has fallen by 33% with the disappearance of many species of ammonites and conodonts and several groups of crinoids. On earth, the most emblematic herbivorous vertebrates, rhynchosaurs and dicynodonts, have disappeared and they also note major changes in insects and plants.

This extinction was quickly followed by a rebound in Life with the appearance of new groups of animals and plants.. The most representative of the following period, dinosaurs, appeared approximately 20 million years before the CPE but their real boom and diversification date after. Probably the more arid conditions that followed were more favorable to their expansion.. And this is also the time of the appearance of the turtles, crocodiles, lizards and early mammals. Still on earth, vegetation changes : it is from this period that the first deposits of amber date, which suggests an increase in coniferous forests, the resin of which is at the origin and the emergence of new ecosystems. The Carnian Rainfall also had an impact on ocean life. It marks the beginning of modern-style coral reefs, as well as many modern groups of plankton, indicating profound changes in ocean chemistry and carbonate cycle.

Dinosaur

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Source: https://www.sciencesetavenir.fr/archeo-paleo/paleontologie/au-coeur-du-trias-une-extinction-passee-inapercue_147487

Extinction, Extinction event, Carnian, Species, Triassic

World news – FR – Discovery of a new mass extinction that would have fostered the rise of dinosaurs

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